#186: Add onToggleCollapse callback#276

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AtlHermanChow wants to merge 2 commits intomac-s-g:masterfrom

AtlHermanChow:Add_toggle_collapse_callback

Commits on Jan 17, 2020

#186: Add onToggleCollapse callback that returns new expanded state, name, namespace and rjvId.
AtlHermanChow
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Commits on Jan 20, 2020

#186: Update types and README for the onToggleCollapse callback. Removed rjvId as it appears to be more of an internal id that isn't exposed to consumers.
AtlHermanChow
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